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Figure 1 shows how this would work for a square area of 28 feet by 20 feet and
using stereo signals. Using our spacing rules as shown in Table 1, leads to the need
for four speakers. The loudspeaker coverage pattern is shown in the diagram.
Figure 2 shows the same area as Figure 1, however the number of speakers has
increased by 2. You can see a greater area of stereo coverage and this would
also have a more even sound level across the listening area. This illustrates
the fact that not using the maximum spacing allowed leads to improved
sound quality.
Achieving high quality stereo coverage in a large area is costly. You need to use
more speakers and more amplifier power or separate amplifiers. If a large area
needs to be covered, consider using a summed stereo or mono signal for each
speaker. If summing the stereo inputs into the amplifier or setting the amplifier to
play in mono is acceptable, the loudspeakers can be spaced 8 feet from the sides
and 16 feet from each other. The row spacing between speakers should be less than
30 feet. This will increase the area your loudspeakers will cover.
Sources
Stereo
Mono
Note: These are maximun recomended distances, sound quality is improved if
you use smaller spacings.
Figure 2 Stereo Coverage 6 speakers
Spacing
Spacing Between
from Sides
Speakers within a row
8 ft
2.4m
8 ft
2.4m
Table 1 Spacing Rules
Between Rows
12 ft
20 ft
3.7m
6.1m
16 ft
30 ft
4.9m
9.1m
Spacing
6
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